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Risk Management Activities - Outstanding commodity derivative instruments designated as hedging instruments (Details) - Electricity - Cash flow hedges - Commodity risk management - MWh | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 95,000 | 222,000
Notional amount purchased | 0 | 0

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Derivative, Nonmonetary Notional Amount Purchased Per Hour + References No definition available. + Details
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Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

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- Definition Derivative, Nonmonetary Notional Amount Sold Per Hour + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Details
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- Details
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- Details
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